packageInfo: unnecessary test removal

removed non-fallback case for app bundleId as is already covered under store_test file
removed unnecessary helper function setPackageInfo

Author: Abhisheksainii

test/model/binding.dart

@@ -236,14 +236,11 @@ class TestZulipBinding extends ZulipBinding {
   }
 
   @override
-  Future<PackageInfo?> get packageInfo async => packageInfoResult;
+  Future<PackageInfo> get packageInfo async => packageInfoResult?? _defaultPackageInfo;
 
   @override
   PackageInfo? get syncPackageInfo => packageInfoResult;
 
-  void setPackageInfo(PackageInfo? packageInfo){
-    packageInfoResult= packageInfo;
-  }
 
   void _resetFirebase() {
     _firebaseInitialized = false;

test/notifications/receive_test.dart

@@ -32,20 +32,15 @@ void main() {
   });
 
   group('tokens', () {
-    test('APNs token registration using correct app bundle ID', () async {
-      await init();
-      check((await testBinding.packageInfo)?.packageName)
-        .equals('com.zulip.flutter.test');
-    }, );
 
     test('Fallback to default appBundleId if packageInfo is null', () async {
       await init();
       // setting package Info to null
-      testBinding.setPackageInfo(null);
+      testBinding.packageInfoResult=null;
 
       const defaultAppId = 'com.zulip.flutter.test';
 
-      check((await testBinding.packageInfo)?.packageName?? defaultAppId)
+      check((await testBinding.packageInfo).packageName)
         .equals(defaultAppId);
     }, );
   });